Thanks for all your suggestions. This list will never be finished, because there are soo many things that changed...but that is half the fun.
I am sticking mostly with the biggest changes, so i will go thru all your suggestions later on tonight and edit my list.
Moonlight, I am pretty sure raingutters weren't available until '74...if a 73 has them more than likely they were added by the owner after GM introduced them. My '73 does not have them in case you were wondering. I am not going to go into great depth on things like woodgrain patters, headlight bezel color, and gas pedal shape, I may, but can you see how long this list would become? You gave me some good additions tho, and I will add as many as I can.
Grim, thanks for yours too, I will get them added.
Ken, got most of yours already, but I did miss a few.
Once again, thanks for the info...and keep them coming.